Diquat
Lakewood Water Department
Diquat is a herbicide used on potato crops and aquatic weeds.
19
Samples
0
Samples exceeding legal limit (MCL)
0
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2014 | N/A | 0 | 0 | N/A |
| 2015 | ND | 9 | 0 | ND |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | ND | 10 | 0 | ND |
| 2019 | N/A | 0 | 0 | N/A |
ppb = parts per billion
State and national drinking water standards and health guidelines
EWG Health Guideline 6 ppb
The EWG Health Guideline of 6 ppb for diquat was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against cataracts.
EPA Maximum Contaminant
Level (MCL) 20 ppb
The legal limit for diquat, established in 1992, was based on a toxicity study in laboratory animals conducted in the 1980s.
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2015-02-17 | 2706-052-0930 | ND |
| 2015-02-17 | 2706-022-1100 | ND |
| 2015-03-31 | 2706-001-0905 | ND |
| 2015-03-31 | 2706-015-0845 | ND |
| 2015-03-31 | 2706-016-0855 | ND |
| 2015-05-28 | 2706-001-1425 | ND |
| 2015-05-28 | 2706-052-1135 | ND |
| 2015-05-28 | 2706-016-1400 | ND |
| 2015-05-28 | 2706-015-1340 | ND |
| 2018-05-14 | 9588-015-0804 | ND |
| 2018-05-14 | 9588-016-0837 | ND |
| 2018-05-14 | 9588-022-0842 | ND |
| 2018-05-14 | 9588-001-0903 | ND |
| 2018-05-14 | 9588-052-0951 | ND |
| 2018-08-06 | 9588-015-1000 | ND |
| 2018-08-06 | 9588-016-1019 | ND |
| 2018-08-06 | 9588-022-1110 | ND |
| 2018-08-06 | 9588-001-1050 | ND |
| 2018-08-06 | 9588-052-0800 | ND |